Until now in Indonesia, there is no specific regulation regarding aircraft as collateral object. As a result, in practice, the aviation industry players experienced obstacles related to aircraft financing by guarantee agreements with aircraft objects. Such conditions create legal uncertainty both for credit providers (creditors) and the aircraft guarantees (debtors), because there are no references or signs that can provide direction in the guarantee agreement. If there is a default by the debtor, the creditor has no legal basis for how to execute it. To fill the legal vacuum, in practice, a guarantee agreement was found with the fiduciary deed of the aircraft. Whereas the Fiduciary Law expressly states that it does not apply to (mortgages) aircraft. While on the other hand, Law No. 20 of 2014 concerning Notary Position gives authority to the notary to make an aircraft mortgage deed. Thus the regulations in Indonesia give signals to use aircraft as collateral object. Such a situation demands the urgency for regulations on aircraft guarantee that can provide legal certainty and legal protection for the parties.

During the pandemic, the Indonesian government implemented policies to protect citizens from the virus. One such policy mandated the use of the PeduliLindungi application for passengers traveling domestically or internationally by land, sea, or air. The application helps monitor and track the virus's spread, and provides vaccination information. This study examines the government's policies on PeduliLindungi's use and how the existing legal culture relates to vaccination and quarantine within the app. The research methodology employed a doctrinal approach, analyzing laws, concepts, interpretations, and cases. The study found that the PeduliLindungi application is mandatory for all travelers. It allows passengers to access their vaccination status and determines the required quarantine duration. Violating quarantine orders can result in imprisonment and fines, as per Judge Decision No. 21/Pid.S/2021/PN.Tng. However, limited smartphone ownership restricts public access to the app. Therefore, the government must formulate policies that accommodate individuals without smartphones, ensuring their safety while traveling. Public legal awareness and understanding of the PeduliLindungi app's importance are crucial for protecting public health. Strengthening the legal culture is necessary to promote compliance with health guidelines and informed decision-making. By fostering a robust legal culture, individuals will prioritize health measures, safeguarding their well-being and that of the community.

Shipping between domestic ports must be transported by ships with Indonesian flags and operated by national shipping companies, meaning the cabotage principle. The aim is to prevent and reduce dependence on foreign ships carrying out Indonesia's maritime territory. However, in regulating and implementing the cabotage principle, it is not sure that it can be applied absolutely, which can be interpreted as not reflecting legal certainty. This study aims to analyze the legal certainty of implementation of the cabotage principle in Indonesian territorial waters. This research is a normative study that uses legal, historical, interpretation and case approaches. The case and interpretation approaches are used to examine the cabotage principle concept in legislation and several relevant cases brought to Indonesian courts. The results shows that the regulation of the cabotage principle on sea transportation is found in the form of laws, presidential regulations, presidential instructions and ministerial regulations. However, in other various regulations, the cabotage principle does not apply absolutely (semi-protectionist) or inconsequently. On the one hand, this is because it prohibits foreign ships from operating in Indonesian territory to carry passengers and/or goods between islands or ports. On the other hand, foreign ships are allowed for other activities that do not include carrying passengers and/or goods with certain conditions and approval from the government. The application of the cabotage principle based on judges' considerations in cases submitted to the State Administrative, Supreme and the Constitutional Courts has fulfilled legal certainty according to the Shipping Law. However, the protection of national Shipping must be prioritized, and the use of foreign ships should be considerably tightened unless Indonesian-flagged vessels are not insufficiently available.

The act of utilising all the resources owned by a state, including natural resources, is the right of every state. However, its use is prohibited if it causes harm to other states. This is then referred to as the principle of no harm rule in international law. Therefore, each state is responsible not for causing damage to other States' environments or areas outside the limits of its jurisdiction. This article will analyse the development of the no harm rules and its application model for claiming state responsibility. As normative research, it used secondary data as the main data, and the primary, secondary and tertiary legal materials were analysed qualitatively. In discussion, this principle has long existed as customary international law to mitigate transboundary pollution. In the case of the environment in general, many studies have applied this principle. However, due to the uniqueness of the climate change issue, evidence and proof of the impacts caused cannot be used as the basis for a lawsuit like ordinary environmental cases. Based on the discussion and simulation conducted, it is concluded that the no harm rules principle can be applied to climate change issues. However, this principle is not satisfactory and has limitations in its application.