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For - at least in our case - all projects that require handling of binary files, locking is required. Other SVN clients offer a lock and unlock functionality. Lack of this totally prevents Netbeans from being usable with svn in our environment. It is widely understood that merging line-based files is the new way to go with svn; however there should be the possibility to work with the svn:needs-lock property with binary data.
*** This issue has been marked as a duplicate of 95177 ***