Pantydraco

The way I see ship design sharing done is through blueprints with privelege parameters.
 
Whenever someone designs ship from scratch, or starting from another full privilege, he gets to make blueprint with full privelege and full access. But when he wants to sell it (copy of it to be precise), he can restrict what other person can do with it, to protect his intelectual property. Important parameters:
 
1)Modification. If blueprint has modification allowed, buyer can do whatever he wants we ship he build, replace parts however he wants, and keep changes in blueprint for rebuild and repair. If not, no modules can be added or removed from ship through build mode.
 
2)Multiplication. If blueprint has multiplication allowed, player can build any number of ships he wants from blueprint, or copy blueprint any number of times without adding additional priveleges. If not, blueprint cannot be copied, and whenever new ship is built from BP, previous self-destructs. This allows ships to be resold while keeping intelectual property intact.
EDIT: aditional royalty option that allows copying, but for every copy specific amount of money is transfered to owner of 'father' blueprint
2.5)Limited Multiplication. Same as normal Multiplication, but copies themself cannot have Multiplication. On the other hand, those copies also don't have any Master Access. Such system simulatiously protects interests of buyers and BP designer.
 
2.9)No rebuild. If blueprint doesn't have multiplication, it may also have no rebuilt parameter. It means blueprint is automatically destroyed when corresponding ship dies. Blueprint with no rebuild means after ship is destroyed, owner cannot rebuild and had to buy new. If BP allows rebuild, owner can rebuild ship after destruction without buying new blueprint.
 
3)Master Access. It defines that another bluprint is 'father' to this one, and whoever has 'father' blueprint, can change privelege parameters on this one at any time. This allows to sell blueprints to ship building companies on flexible conditions, while granting BP designer defense from abuse.
 
 
 
All in all, blueprints may: have or not have 'father'; be modifyable or not; be multiplyable or limited-multiplyable or rebuildable or non-rebuildable; have royalty amount or not; be administrated by 'father' or not;
 
Also, pretty much any object should have some form of blueprint for repair purposes.
 
Currency wise, blueprint copies are normal items and can be traded for whatever currency or barter items.
Cheers!