Sorry I didn't read that right. Here, you can go to court over say getting the moulds returned and any breach of contract. IP is somewhat protected.
A similar course of action in china looks like hell. You really have to do your homework. Snippet taken from
https://harrisbricken.com/chinalawblog/contracts-in-china-enforce-it-or-go-home/"... To pursue a claim successfully against a Chinese company, the following is usually required:
First, there must be a written contract between the parties, executed by both parties in accordance with the Chinese law requirements. It used to be common to do business in China without a contract. Much OEM manufacturing in China is done on a purchase order basis, with no underlying contract. Much service work done by foreigners for Chinese clients is based on an exchange of emails. Back in the days when China had no laws and no courts, this informal approach made some sense because there was no alternative. Today, however, to be able to bring a plausible claim against a Chinese company, the foreign plaintiff almost always must be able to show a formal relationship between the parties. Unlike in the U.S. or the EUR, Chinese courts rarely allow for proving the existence of a contract by putting together pieces evidenced by scattered POs, invoices, emails and desperate phone calls. The court will insist on a written agreement that unambiguously names the parties and provides the basis for the agreement.
Second, the contract must be enforceable in China. As a practical matter, Chinese courts incredibly rarely enforce foreign judgments and it can be quite difficult to get them to enforce a foreign arbitration award. A contract enforceable in China must meet the following basic standards:
1. The contract is governed by Chinese law. Under Chinese law, it is permissible to provide that the contract be governed by foreign law. However, providing for foreign law all but guarantees failure in a Chinese court because Chinese courts require the party to prove every relevant element of foreign law. This is a disaster for several reasons. First, proving foreign law is expensive. Second, proving foreign law leads to delay. Third, skillful defendants will dispute the application of foreign law, rendering your case and even any judgment you receive uncertain.
2. The governing language of the contract is Chinese. Under Chinese law, it is permissible to provide that the governing language of the contract is a foreign language such as English. To do so, however, nearly always leads to disaster. Chinese courts will only work with Chinese language documents. This means the contract must be translated into Chinese. The translation will not be done by the parties but rather by a court appointed translator. The translator is often not particularly skilled and the resulting translation is often simply wrong. Even when the translation is correct, the defendant will often dispute the translation, leading to delays and ultimate uncertainty in the decision. Having someone else translate your contract after you sue means that you do not even know exactly what it is on which you are suing. We are also aware of Chinese courts simply refusing to hear cases that involve contracts in a language other than Chinese.
3. The contract should be enforceable in a Chinese court with jurisdiction over the defendant. This normally means jurisdiction in a court in the district where the defendant has its principal place of business. China has excellent domestic arbitration panels with extensive experience in resolving foreign disputes. But litigation is usually a better alternative for several reasons.
First, in disputes with smaller Chinese companies, there is a concern the company will dissipate assets before a judgment can be obtained. Chinese courts can order a prejudgment writ of attachment that prevents this. In addition, a prejudgment writ will often convince a smaller Chinese company to resolve the matter quickly.
Second, the plaintiff in a dispute with a Chinese company will often want an order instructing the defendant to take some action such as ceasing to infringe IP rights, return molds or tooling, or appointing a manager or officer of a company. In other words, what would be called injunctive relief in a common law system. Chinese courts have the authority to issue such orders and an arbitration panel does not.
4. The place of litigation should be in the district where the Chinese defendant has its principle place of business. Many foreign parties will seek an agreement for jurisdiction in some neutral district such as Beijing or Shanghai. This is a mistake. First, Chinese courts will simply ignore such agreements. Second, and more important, Chinese courts are reluctant to enforce judgments from other districts and they often will ignore orders issued by Chinese courts from other districts. This means if you get a judgment in Beijing but need to enforce it in Chengdu against your Chinese counter-party, you may not be able to do so."
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I think for OP, and I've made this mistake too is the "discounted" or "no fee" development work flipping the IP situation around:
"The first disaster usually occurs when the Chinese manufacturer does not charge the foreign company anything for the product development work. In these situations, the Chinese manufacturer often will claim that any intellectual property in the developed product is its own and will generously offer to make the product on behalf of the foreign company at price, payment, quantity, quality and delivery terms
chosen by the Chinese manufacturer. Our China lawyers see this all the time, especially with start-up companies involved in making products for the Internet of Things ecosystem. No matter how outrageous the pricing or other demands from the Chinese manufacturer, there is little the foreign company can do because it waited until development was finished before even considering who would end up with “its” IP."
Rest of the article is a very good read
https://harrisbricken.com/chinalawblog/china-product-development-agreements/