Well, much like most of life, nobody knows much of anything.
A OP complains that "made by SONAR" is emblazoned on his SoundCloud song. I don't blame him for being upset, but rather than blaming the logical idea is it the SoundCloud uploading scheme he blames SONAR. Blaming SONAR for something bad here brings out a gag reflex in many forum users, which causes the said OP to dig in. Craig comes along, offers some fact-checked facts and the off-topic remark that certain libraries have to be credited. My first thought about the latter was he heard the library in the song, but maybe he was just pointing out a similar operation to "made by SONAR." Either way, he added the facts that it wasn't a SONAR operation, but part of the SOUNDCLOUD uploading process, and may be mostly a SOUNDCLOUD artifact (along with some other comments). I also learned that Logic and Protools may or may not include the same process and there doesn't seem to be an obvious way to turn it off. Then Craig gets lambasted as trying to hide his connection w/ Gibson and Cakewalk. Which is funny. I forgot to check but I believe his connection w/ Cake/Gibson is in his signature. I've never found he totes the company line, whatever that may be. I do think (as we all should) he takes the viability of the company seriously and does consider problems in light of running a business. Personally, I do have a lot of time and expertise (and money!) invested in SONAR and hope I don't have to start from scratch with another product. I'd never get any of my own songs finished - for a while anyway.
So, the problem remains that if you use SONAR to upload your songs to SoundCloud you will get the attached message. Other DAWs may have the same problem. The simple method to avoid this is to upload your song to SoundCloud outside of the DAW. I tried to get Sonar to work w/ SoundCloud but it seemed was easier just to manually upload it (I have my own mastering method anyway) since I knew how to do that already. If you don't want the message, don't use SONAR (or other DAWS) for their convenience. I've never had SONAR or Sound Forge (or any DAW) attach a credit to an mp3 file. But don't give the companies any ideas.
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[Edit: Craig doesn't have his affiliation w/ Cakewalk "plastered" on his sig - my bad. Still, I imagine most of us here know of it and he certainly doesn't hide it).