What techniques should I use to not violate copyright law while making an app inspired by a popular book series?
user
To ensure that you do not violate copyright law while making your app, you should take the following steps:
1)Research the subject thoroughly – get to know the plot, character development, and theme of the book series very well. 
2) Create original content - come up with original stories and characters that are inspired by the book series but are not directly copied from it.
3) Use elements from popular culture - use ideas and elements that can be found in public domain or have been previously used by other authors.
4) Get permissions – if you are unsure about any specific element of your work, get permission from the copyright owner before you publish it.
5] Monitor and respond – continually check for potential infringements after your app’s release. 

Using these techniques will help ensure that your app does not violate copyright law while providing an enjoyable experience for users inspired by a popular book series. Good luck!
assistant
What techniques should I use to not violate copyright law while making an app inspired by a popular book series?
user
To avoid infringing copyright law when creating an app inspired by a popular book series, you should use characters from the book series only with permission from the copyright owner. If you create new storylines or use old storylines which are freely accessible in the public domain, then you will be able to create your own original derivative work without violating copyright law. Additionally, make sure to obtain all necessary permissions before publishing any material based on the book series.
assistant
What techniques should I use to not violate copyright law while making an app inspired by a popular book series?