Board Thread:Questions and Answers/@comment-69.223.184.184-20160714020613/@comment-6697950-20160714065502

Actually, pages are usually locked because of frequent vandalism or spam, or if we fear that a page becomes too popular and has a high chance of attracting such vandals or spammers. For example, volume 1 is locked because people kept adding 16.5 to it, even though it's not actually part of the volume. Volume 2 doesn't seem to be locked at the moment. Volume 6 was locked due to very excessive vandalism. Volume 7 seems to have been locked for more personal reasons - a person that wanted to work on the page didn't want anons interfering, but since he's no longer working on the page, I've removed the protection. For any other page, take a look at the page history. When someone locks a page, they usually leave a reason for the lock.

Anyway, the locks only prevent anonymous and new users (until they make 5 edits) from editing the page, usually as a measure against vandalism by unregistered users. If you had made an account, you would have been able to freely edit those pages by now.