Is there a copyright problem with using a program to draw?

I usually draw on my iPhone using the app, IbisPaint X. I decided to make a drawing of my friends. I wanted to give a printed out copy of the drawing to them. However, when I went to print the drawing out at the store, the worker kept pressuring me and saying that it was copyrighted. He said that I used the app, and stole the art. The worker kept complaining that the app will sue him and he will get fired. Either way, he made me sign papers before I could finally print my drawing out.

I told this story to my friends and even showed them my artwork. I completely made this drawing myself and worked extra hard on it. They believe the worker was right because I was using a drawing app. My parents even said that if I just drew on paper, I would have any problems.

Please help me! I'm thinking that because I use a program, I'm causing problems! Am I really doing anything wrong?!

No you're not

If you draw on paper, would the pencil maker sue you?

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Your language is faulty, so the question is faulty, so Answers will be misconstrued to correct right answers,

Because you did not mention the company at fault, we can't negate whether or not they were valid, so now you have to go online and research company, cause it sounds like you were tricked, but again we do not know who or where you are nee country and the copyright issues of that country,

If you own device and you own App or it is freeware, the art you make is yours, so worse off, you just signed papers that that store clerk could use agaist you, or you did not read fine print correctly, they might now own your artwork, which is foolish to not know or understand what you did, if you have copy of signed papers ( which you should) you read and show to legal council, adviser, not us,

Copyright does not belong to App company unless you sign forms in agreement with App company, not the store print service, so something is not right about what you state or missing information.
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Absolute nonsense.

Look at points 7 and 8 of the EULA

The worker at the print store did not understand what they were talking about, it is probably due to failed training on the part of a manager.

The misunderstanding of copyright law is growing.

When you use software to create a graphic, the software company does not own the copyright to your creations. It's just a tool. The guy at the print shop is being a little too strict, probably because he doesn't understand anything about it other than what he was told.

No. If you've created your own drawings using the app on your smartphone, then you're in the clear. Remember these are the drawings that you did yourself.