May I apply the term "lean" if I adapt lean startup concepts & apply them outside entrepreneurship w/o infringing on any legal protections of "lean"?

Mobile app that has launched: You need ALL of the following: 1) Trending towards or at 100000 installs within first 90 days of launch; 2) Day 30 retention rate of at least 20% 3) Core "MTM" (metric that matters) healthy (dependent on business model, usage model etc) 4) Evidence that growth is just "getting started" with plenty of upside left. Happy to talk more in a call.

My answer will be short: Definitely an app. I'll be more than happy to discuss details further.

(I'm a small biz attorney who helps people with copyright, trademark, and other IP law, and I'm answering per U.S. law.) As soon as you take your idea and put it into a tangible format (write it down, create an infographic, record a video), then that writing/infographic/video is automatically protected by copyright law. You can record the copyright on it too, which makes it easier to protect and get damages from other people taking it. But the formula itself would be probably protected under trade secret law or patent law. Patent law obviously takes a bit more effort, because you have to apply for the patent and get your application examined by the USPTO, which takes years and $$$. Keeping it protected under trade secret law means you have to make an effort to keep it secret (which may not work if you are disclosing it as part of your marketing efforts), such as keeping it confidential and requiring NDAs. As someone else said, the other terms you use might be protected under trademark law. If a member of the public would use those terms to link your products/services with the source of the product/service (aka, your company), then they could be trademark-able. There are some state law protections for trademarks, and you can also file to register the trademark with the USPTO and get more protection. Hope that gets your started!

This is a tricky question as you are entering a gray area if you are using material from Book Z to inspire your own book. Derivatives works are highly litigated and there is case law that you could turn to to help you make this decision but based on your example its going to be a fine line. You would have to be able to distinguish the products as two very separate works. Since the original book Z is inspiring your new book this may be hard to do. It might actually be easier to talk with the original author about your future plans and develop an agreement between the two of you where he waives any claims he might have here in exchange for recognition in your book. Just an idea--FYI- this is NOT LEGAL ADVICE. You should consult with an attorney in more detail here.

Wow, lots of questions here. Let me try to hit them in order: "Should I get a job or find investors?" IF you have access to enough investor capital (not debt and not your savings) and you can get to MVP and still maintain ownership of a sizable majority of the business then do it. IF that means debt financing then only use the debt lines the cost of which can be carried by returns generated by the use of funds. I would prefer to offer a convertible note to prospective investors that can be easily extended throughout both friends and family and seed rounds (up to $2M to $3M) to get to proof in the market. If you can get to revenue and earnings fast enough then you can avoid equity dilution all together. IF you cannot secure that find of funding AND you cannot produce enough revenue from your business to deliver sufficient earnings for you to live on, then by all means, you should find a way to make the money you need and not burn all your savings or mortgage your home If that means short term contract work that's great. Particularly if you can find log term work that is relevant to the business you're building. If that means taking a job then do that. IF you do that, then yes, be transparent with your employer and let them know you're working on your own business also. Hope this helps....