For all web programmers the source code of their webpages is highly valuable, so any security measure to protect them is little. For this reason a program like HTML Password Lock is always appreciated.
From HTML Password Lock you can put passwords on each of your web pages, so only you can access the content. You can even assign a different password for each programmer that accesses the code; this way whoever edits or modifies it is registered in a log.
The passwords, if you want, can be randomly placed. Only the program administrator will know all the passwords for all the programmers. HTML Password Lock lets you assign passwords to HTML, ASP, PHP, CGI, etc pages.