diff --git a/CODE_OF_CONDUCT.adoc b/CODE_OF_CONDUCT.adoc
index f64fb1b..33ae7bc 100644
--- a/CODE_OF_CONDUCT.adoc
+++ b/CODE_OF_CONDUCT.adoc
@@ -24,4 +24,4 @@ Instances of abusive, harassing, or otherwise unacceptable behavior may be repor
All complaints will be reviewed and investigated and will result in a response that is deemed necessary and appropriate to the circumstances.
Maintainers are obligated to maintain confidentiality with regard to the reporter of an incident.
-This Code of Conduct is adapted from the http://contributor-covenant.org[Contributor Covenant], version 1.3.0, available at http://contributor-covenant.org/version/1/3/0/[contributor-covenant.org/version/1/3/0/].
\ No newline at end of file
+This Code of Conduct is adapted from the https://contributor-covenant.org[Contributor Covenant], version 1.3.0, available at https://contributor-covenant.org/version/1/3/0/[contributor-covenant.org/version/1/3/0/].
\ No newline at end of file
diff --git a/README.adoc b/README.adoc
index f13c29d..67223f0 100644
--- a/README.adoc
+++ b/README.adoc
@@ -33,7 +33,7 @@ For snapshot versions, make sure you include the spring snapshots repository:
spring-libs-snapshot
- http://repo.spring.io/libs-snapshot
+ https://repo.spring.io/libs-snapshot
----
@@ -88,10 +88,10 @@ To have the maximum performance we encourage you to use the latest Spring 4.1.x
Here are some ways for you to get involved in the community:
-* Get involved with the Spring community by helping out on http://stackoverflow.com/questions/tagged/spring-data-keyvalue[stackoverflow] by responding to questions and joining the debate.
+* Get involved with the Spring community by helping out on https://stackoverflow.com/questions/tagged/spring-data-keyvalue[stackoverflow] by responding to questions and joining the debate.
* Create https://jira.spring.io/browse/DATAKV[JIRA] tickets for bugs and new features and comment and vote on the ones that you are interested in.
-* Github is for social coding: if you want to write code, we encourage contributions through pull requests from http://help.github.com/forking[forks of this repository]. If you want to contribute code this way, please reference a JIRA ticket as well covering the specific issue you are addressing.
-* Watch for upcoming articles on Spring by http://spring.io/blog[subscribing] to spring.io.
+* Github is for social coding: if you want to write code, we encourage contributions through pull requests from https://help.github.com/forking[forks of this repository]. If you want to contribute code this way, please reference a JIRA ticket as well covering the specific issue you are addressing.
+* Watch for upcoming articles on Spring by https://spring.io/blog[subscribing] to spring.io.
Before we accept a non-trivial patch or pull request we will need you to https://cla.pivotal.io/sign/spring[sign the Contributor License Agreement]. Signing the contributor’s agreement does not grant anyone commit rights to the main repository, but it does mean that we can accept your contributions, and you will get an author credit if we do. If you forget to do so, you'll be reminded when you submit a pull request.
Active contributors might be asked to join the core team, and given the ability to merge pull requests.
diff --git a/src/main/asciidoc/images/epub-cover.svg b/src/main/asciidoc/images/epub-cover.svg
index d3f1fb9..86ec152 100644
--- a/src/main/asciidoc/images/epub-cover.svg
+++ b/src/main/asciidoc/images/epub-cover.svg
@@ -1,5 +1,5 @@
-
+