diff --git a/ruma-appservice-api/src/lib.rs b/ruma-appservice-api/src/lib.rs
index f7211f0f..475b088d 100644
--- a/ruma-appservice-api/src/lib.rs
+++ b/ruma-appservice-api/src/lib.rs
@@ -2,7 +2,7 @@
 //! endpoint in the [Matrix](https://matrix.org/) application service API specification. These
 //! types can be shared by application service and server code.
 
-#![warn(missing_copy_implementations, missing_debug_implementations, missing_docs)]
+#![warn(missing_debug_implementations, missing_docs)]
 
 pub mod event;
 pub mod query;
diff --git a/ruma-client-api/src/lib.rs b/ruma-client-api/src/lib.rs
index 304146f6..a1327351 100644
--- a/ruma-client-api/src/lib.rs
+++ b/ruma-client-api/src/lib.rs
@@ -2,7 +2,7 @@
 //! endpoint in the [Matrix](https://matrix.org/) client API specification. These types can be
 //! shared by client and server code.
 
-#![warn(missing_copy_implementations, missing_debug_implementations, missing_docs)]
+#![warn(missing_debug_implementations, missing_docs)]
 
 pub mod error;
 pub mod r0;
diff --git a/ruma-client-api/src/r0/account/register.rs b/ruma-client-api/src/r0/account/register.rs
index 8a0b7eaf..78f628c6 100644
--- a/ruma-client-api/src/r0/account/register.rs
+++ b/ruma-client-api/src/r0/account/register.rs
@@ -100,7 +100,7 @@ impl Response {
 }
 
 /// The kind of account being registered.
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
+#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
 #[serde(rename_all = "snake_case")]
 pub enum RegistrationKind {
     /// A guest account
diff --git a/ruma-client-api/src/r0/capabilities/get_capabilities.rs b/ruma-client-api/src/r0/capabilities/get_capabilities.rs
index b55aad6e..0b04d48d 100644
--- a/ruma-client-api/src/r0/capabilities/get_capabilities.rs
+++ b/ruma-client-api/src/r0/capabilities/get_capabilities.rs
@@ -83,10 +83,10 @@ impl Capabilities {
 }
 
 /// Information about the m.change_password capability
-#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
+#[derive(Clone, Debug, Serialize, Deserialize)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub struct ChangePasswordCapability {
-    /// True if the user can change their password, false otherwise.
+    /// `true` if the user can change their password, `false` otherwise.
     pub enabled: bool,
 }
 
diff --git a/ruma-client-api/src/r0/filter.rs b/ruma-client-api/src/r0/filter.rs
index ea372dba..ca23d741 100644
--- a/ruma-client-api/src/r0/filter.rs
+++ b/ruma-client-api/src/r0/filter.rs
@@ -35,7 +35,7 @@ impl Default for EventFormat {
 }
 
 /// Filters to be applied to room events.
-#[derive(Clone, Copy, Debug, Default, Outgoing, Serialize)]
+#[derive(Clone, Debug, Default, Outgoing, Serialize)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 #[incoming_derive(Clone, Default, Serialize)]
 pub struct RoomEventFilter<'a> {
@@ -142,7 +142,7 @@ impl IncomingRoomEventFilter {
 }
 
 /// Filters to be applied to room data.
-#[derive(Clone, Copy, Debug, Default, Outgoing, Serialize)]
+#[derive(Clone, Debug, Default, Outgoing, Serialize)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 #[incoming_derive(Clone, Default, Serialize)]
 pub struct RoomFilter<'a> {
@@ -224,7 +224,7 @@ impl IncomingRoomFilter {
 }
 
 /// Filter for non-room data.
-#[derive(Clone, Copy, Debug, Default, Outgoing, Serialize)]
+#[derive(Clone, Debug, Default, Outgoing, Serialize)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 #[incoming_derive(Clone, Default, Serialize)]
 pub struct Filter<'a> {
diff --git a/ruma-client-api/src/r0/keys.rs b/ruma-client-api/src/r0/keys.rs
index e5136c2b..a0e85825 100644
--- a/ruma-client-api/src/r0/keys.rs
+++ b/ruma-client-api/src/r0/keys.rs
@@ -54,7 +54,7 @@ pub struct CrossSigningKey {
 }
 
 /// The usage of a cross signing key.
-#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize)]
 #[serde(rename_all = "snake_case")]
 pub enum KeyUsage {
     /// Master key.
diff --git a/ruma-client-api/src/r0/message/get_message_events.rs b/ruma-client-api/src/r0/message/get_message_events.rs
index c2824f8c..884f974d 100644
--- a/ruma-client-api/src/r0/message/get_message_events.rs
+++ b/ruma-client-api/src/r0/message/get_message_events.rs
@@ -120,7 +120,7 @@ fn is_default_limit(val: &UInt) -> bool {
 }
 
 /// The direction to return events from.
-#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize)]
 pub enum Direction {
     /// Return events backwards in time from the requested `from` token.
     #[serde(rename = "b")]
diff --git a/ruma-client-api/src/r0/search/search_events.rs b/ruma-client-api/src/r0/search/search_events.rs
index 7cee0927..593dbb7b 100644
--- a/ruma-client-api/src/r0/search/search_events.rs
+++ b/ruma-client-api/src/r0/search/search_events.rs
@@ -118,7 +118,7 @@ impl<'a> Criteria<'a> {
 }
 
 /// Configures whether any context for the events returned are included in the response.
-#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub struct EventContext {
     /// How many events before the result are returned.
@@ -250,7 +250,7 @@ pub enum GroupingKey {
 }
 
 /// Requests that the server partitions the result set based on the provided list of keys.
-#[derive(Clone, Copy, Default, Debug, Outgoing, Serialize)]
+#[derive(Clone, Default, Debug, Outgoing, Serialize)]
 #[incoming_derive(Default)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub struct Groupings<'a> {
diff --git a/ruma-client-api/src/r0/session/get_login_types.rs b/ruma-client-api/src/r0/session/get_login_types.rs
index b17b99c3..c2050663 100644
--- a/ruma-client-api/src/r0/session/get_login_types.rs
+++ b/ruma-client-api/src/r0/session/get_login_types.rs
@@ -39,7 +39,7 @@ impl Response {
 }
 
 /// An authentication mechanism.
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize, Serialize)]
+#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
 #[serde(tag = "type")]
 pub enum LoginType {
     /// A password is supplied to authenticate.
diff --git a/ruma-client-api/src/r0/session/login.rs b/ruma-client-api/src/r0/session/login.rs
index 71cefab5..2337d6b1 100644
--- a/ruma-client-api/src/r0/session/login.rs
+++ b/ruma-client-api/src/r0/session/login.rs
@@ -107,7 +107,7 @@ pub enum UserInfo<'a> {
 }
 
 /// The authentication mechanism.
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Outgoing, Serialize)]
+#[derive(Clone, Debug, PartialEq, Eq, Outgoing, Serialize)]
 #[serde(tag = "type")]
 pub enum LoginInfo<'a> {
     /// A password is supplied to authenticate.
diff --git a/ruma-client-api/src/r0/sync/sync_events.rs b/ruma-client-api/src/r0/sync/sync_events.rs
index a8935172..46084624 100644
--- a/ruma-client-api/src/r0/sync/sync_events.rs
+++ b/ruma-client-api/src/r0/sync/sync_events.rs
@@ -264,7 +264,7 @@ impl JoinedRoom {
 }
 
 /// unread notifications count
-#[derive(Clone, Copy, Default, Debug, Deserialize, Serialize)]
+#[derive(Clone, Default, Debug, Deserialize, Serialize)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub struct UnreadNotificationsCount {
     /// The number of unread notifications for this room with the highlight flag set.
diff --git a/ruma-client/src/lib.rs b/ruma-client/src/lib.rs
index f2f5f2eb..6bc450c1 100644
--- a/ruma-client/src/lib.rs
+++ b/ruma-client/src/lib.rs
@@ -98,7 +98,7 @@
 //! ```
 
 #![warn(rust_2018_idioms)]
-#![deny(missing_copy_implementations, missing_debug_implementations, missing_docs)]
+#![deny(missing_debug_implementations, missing_docs)]
 
 use std::{
     convert::TryFrom,
diff --git a/ruma-events/src/error.rs b/ruma-events/src/error.rs
index 5aba15c6..f446db05 100644
--- a/ruma-events/src/error.rs
+++ b/ruma-events/src/error.rs
@@ -19,7 +19,7 @@ impl Display for InvalidInput {
 impl Error for InvalidInput {}
 
 /// An error when attempting to create a value from a string via the `FromStr` trait.
-#[derive(Clone, Copy, Eq, Debug, Hash, PartialEq)]
+#[derive(Clone, Eq, Debug, Hash, PartialEq)]
 pub struct FromStrError;
 
 impl Display for FromStrError {
diff --git a/ruma-events/src/room/member.rs b/ruma-events/src/room/member.rs
index cdc126fd..b5d038cc 100644
--- a/ruma-events/src/room/member.rs
+++ b/ruma-events/src/room/member.rs
@@ -116,7 +116,7 @@ pub struct SignedContent {
 }
 
 /// Translation of the membership change in `m.room.member` event.
-#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub enum MembershipChange {
     /// No change.
diff --git a/ruma-events/src/room/power_levels.rs b/ruma-events/src/room/power_levels.rs
index d0d60123..3fe22c93 100644
--- a/ruma-events/src/room/power_levels.rs
+++ b/ruma-events/src/room/power_levels.rs
@@ -127,7 +127,7 @@ impl Default for PowerLevelsEventContent {
 }
 
 /// The power level requirements for specific notification types.
-#[derive(Clone, Copy, Debug, PartialEq, Deserialize, Serialize)]
+#[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
 pub struct NotificationPowerLevels {
     /// The level required to trigger an `@room` notification.
     #[cfg_attr(
diff --git a/ruma-identifiers/src/lib.rs b/ruma-identifiers/src/lib.rs
index d2825383..7a2eb1c6 100644
--- a/ruma-identifiers/src/lib.rs
+++ b/ruma-identifiers/src/lib.rs
@@ -1,12 +1,7 @@
 //! Crate **ruma_identifiers** contains types for [Matrix](https://matrix.org/) identifiers
 //! for events, rooms, room aliases, room versions, and users.
 
-#![warn(
-    rust_2018_idioms,
-    missing_copy_implementations,
-    missing_debug_implementations,
-    missing_docs
-)]
+#![warn(rust_2018_idioms, missing_debug_implementations, missing_docs)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
 
 // Renamed in `Cargo.toml` so we can have a serde feature.
diff --git a/ruma-push-gateway-api/src/send_event_notification/v1.rs b/ruma-push-gateway-api/src/send_event_notification/v1.rs
index f47dc3e5..aff29348 100644
--- a/ruma-push-gateway-api/src/send_event_notification/v1.rs
+++ b/ruma-push-gateway-api/src/send_event_notification/v1.rs
@@ -154,7 +154,7 @@ impl Default for NotificationPriority {
 }
 
 /// Type for passing information about notification counts.
-#[derive(Clone, Copy, Debug, Default, Deserialize, Serialize, PartialEq)]
+#[derive(Clone, Debug, Default, Deserialize, Serialize, PartialEq)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub struct NotificationCounts {
     /// The number of unread messages a user has across all of the rooms they
diff --git a/ruma-signatures/src/lib.rs b/ruma-signatures/src/lib.rs
index 7675175d..c3a3ad51 100644
--- a/ruma-signatures/src/lib.rs
+++ b/ruma-signatures/src/lib.rs
@@ -42,7 +42,7 @@
 //! these respective functions for more details and full examples of use.
 
 #![warn(rust_2018_idioms)]
-#![deny(missing_copy_implementations, missing_debug_implementations, missing_docs)]
+#![deny(missing_debug_implementations, missing_docs)]
 
 use std::{
     error::Error as StdError,
@@ -117,7 +117,7 @@ impl From<ruma_serde::CanonicalJsonError> for Error {
 }
 
 /// The algorithm used for signing data.
-#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq, AsRefStr, DisplayAsRefStr)]
+#[derive(Clone, Debug, Eq, Hash, PartialEq, AsRefStr, DisplayAsRefStr)]
 #[ruma_enum(rename_all = "snake_case")]
 pub enum Algorithm {
     /// The Ed25519 digital signature algorithm.
diff --git a/ruma-signatures/src/signatures.rs b/ruma-signatures/src/signatures.rs
index ad8112a4..a599915a 100644
--- a/ruma-signatures/src/signatures.rs
+++ b/ruma-signatures/src/signatures.rs
@@ -62,8 +62,8 @@ impl Signature {
     }
 
     /// The algorithm used to generate the signature.
-    pub fn algorithm(&self) -> Algorithm {
-        self.algorithm
+    pub fn algorithm(&self) -> &Algorithm {
+        &self.algorithm
     }
 
     /// The raw bytes of the signature.
diff --git a/ruma-signatures/src/verification.rs b/ruma-signatures/src/verification.rs
index 5709b108..106a9c42 100644
--- a/ruma-signatures/src/verification.rs
+++ b/ruma-signatures/src/verification.rs
@@ -23,7 +23,7 @@ pub trait Verifier {
 }
 
 /// A verifier for Ed25519 digital signatures.
-#[derive(Clone, Copy, Debug, Default, PartialEq)]
+#[derive(Debug, Default, PartialEq)]
 pub struct Ed25519Verifier;
 
 impl Verifier for Ed25519Verifier {
@@ -46,7 +46,7 @@ impl Verifier for Ed25519Verifier {
 /// calculated during verification. This is not necessarily an error condition, as it may indicate
 /// that the event has been redacted. In this case, receiving homeservers should store a redacted
 /// version of the event.
-#[derive(Debug, Clone, Copy, Hash, PartialEq)]
+#[derive(Clone, Debug, Hash, PartialEq)]
 pub enum Verified {
     /// All signatures are valid and the content hashes match.
     All,