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how to protect my project file?
just want to know,if someone got the .jason files and .png files of spine project, can he convert it as .project file? or can he modify .jason file? Is there any protection of Spine files?
If someone has your data, no matter what the format, they can do anything with it. Eg, someone can pull the PNG or JSON files from your app and do whatever they want. Spine can import the exported JSON and binary skeleton and animation files, so yes someone could modify your animations. If you are worried you might do a checksum and obfuscate your data, but there is no protection. If there were some way to protect software, it wouldn't be possible to steal Microsoft, Adobe, etc software. 
So, can Spine checksum and obfuscate the exported data? or do something else to protect art works?
If you want to protect your files, the easiest thing to do is to pack them away in a protected archive, and extract them to memory at runtime. Simple obfuscation will deter casual modification attempts. Nothing you can do will stop a truly dedicated modder. (Who you should embrace anyway.)
No, Spine won't attempt to obfuscate. This is application specific.
Of course. I meant that he needed to perform that obfuscation on his own.